The FBI opened an investigation Monday into the death of 18-year-old Michael Brown, who police said was shot multiple times Saturday after being confronted by a white officer in Ferguson, a 21,000-resident suburb that’s nearly 70 percent black.

A North Texas man accused of sending more than 500 hoax letters that contained a white powder to schools, government offices, day care centers and other locations in the U.S. and around the world was arrested Monday, federal authorities announced.

A media account reports that the National Security Agency and the FBI covertly scanned the emails of five prominent Muslim-Americans under the government’s secret surveillance program aimed at foreign terrorists and other national security threats.

The House of Representatives passed a late-night vote on Thursday to cut funding to two of the National Security Agency’s most controversial practices: warrantless collection of Americans’ online data and the installation of surveillance “backdoors” on commercial tech products.